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Evaluation of Pumpkin Cultivars for Powdery and Downy Mildew

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Evaluation of Pumpkin Cultivars for Powdery and Downy Mildew HORTSCIENCE 35(2):281–285. 2000. Materials and Methods Pumpkin cultivar evaluations were con- Evaluation of Pumpkin Cultivars for ducted at the Coastal Research and Education Center, Charleston, S.C., on Yonges loamy Powdery and Downy Mildew fine sand (fine-loamy, mixed, thermic, Typic Albaquults). The experiments were random- Resistance, Virus Tolerance, and Yield ized complete blocks with three replications in 1996 and four replications in 1997. Each plot Anthony P. Keinath1 and Virginia B. DuBose2 was a single row of eight plants. In previous cultivar evaluations, pumpkins Department of Plant Pathology and Physiology, Clemson University, Coastal with different maturity dates were all seeded Research and Education Center, Charleston, SC 29414-5332 or transplanted and harvested at the same time, which may not provide an equitable yield Additional index words. Cucurbita pepo, Cucurbita maxima, papaya ringspot virus, comparison among cultivars (Bost et al., 1991; Pseudoperonospora cubensis, Sphaerotheca fuliginea, watermelon mosaic virus, zucchini Precheur et al., 1994, 1998). In our experi- yellow mosaic virus ments, three seeding and transplanting dates Abstract. Twenty-six cultivars and two numbered selections of Cucurbita pepo L. pumpkin were used so that all cultigens reached matu- and four cultivars of C. maxima Duchesne pumpkin were evaluated in field experiments rity at the same time, because harvest date is in 1996 and 1997 in Charleston, S.C. The four C. maxima cultivars (‘Mammoth Gold’, ‘Big important for marketing pumpkins. Thirty- Max’, ‘Rouge Vif d’Etamps’, and ‘Lumina’) and three C. pepo cultigens (HMX 6686, HMX two pumpkin cultigens were separated into 6688, and Magic Lantern) had lower powdery mildew [Sphaerotheca fuliginea three groups based upon days to maturity (Schlechtend.:Fr.) Pollacci] severities than did the other C. pepo cultivars. Overall, C. (DTM) as indicated by seed company descrip- maxima cultivars also had less foliage showing virus symptoms and less downy mildew tions. Long- (110-120 d), mid- (100-105 d), [Pseudoperonospora cubensis (Berk.& M.A. Curtis) Rostovzev] than did C. pepo cultigens. and short-season (85-95 d) pumpkins were Mid- and long-season cultigens of both species (≥100 days to maturity) produced a greater seeded on 11 June, 21 June, and 1 July 1996, number of marketable-quality fruit than did short-season cultigens. Cucurbita maxima respectively, and 27 June, 8 and 18 July 1997, and C. pepo produced similar numbers of marketable fruit; however, more potential respectively. Seedlings within each maturity marketable yield was possible in C. maxima since most fruit were affected by virus. The C. date were transplanted to the field 10 or 11 d pepo cultigens Spookie, HMX 6686, and Spooktacular produced the greatest numbers of after seeding, so that the harvest dates would marketable fruit. In general, no cultigens were well-adapted to the growing conditions of coincide. Plants were spaced 0.9 m apart within the humid coastal plain of the southeastern United States. rows in 1996 and 1.2 m apart in 1997. Plots were separated by 3.0 m of space within rows. Pumpkin can be a profitable crop when mation is available on management of pump- Row spacing was 1.8 m on bed center and grown for the Halloween market. Because of kin diseases in the southeastern coastal plain. every other row was planted. Transplants that the high potential return per hectare, pumpkin Minimizing pesticide inputs may improve the died within 1 week of transplanting were re- is particularly suited for growers with limited profit margin of the crop (Olson et al., 1995), placed so that all plots contained eight plants. acreage or those located near urban areas. To although some fungicide must be applied to In 1996, but not in 1997, vines were moved yield well under current management prac- prevent premature defoliation and senescence. into the 1.8-m-wide area until late in the sea- tices, pumpkin requires expensive inputs, such Careful selection of pumpkin cultivar can son because of sprayer limitations. as white or black polyethylene mulch and reduce disease severity. For example, without Before planting, 900 kg·ha–1 of 10N–4.4P– regular insecticide and fungicide applications fungicide applications, ‘Big Max’ had less 8.3K (1996) or 670 kg·ha–1 of 15N–0P–12.5K (Kemble et al., 1997). Because pumpkin has a downy and powdery mildew than seven other fertilizer (1997) were broadcast before raised long growing season (90 to 120 d) and is cultivars (Bost et al., 1991). The heirloom beds were shaped and covered with white-on- planted later than most warm-season vegetable cultivar Rouge Vif d’Etamps had significantly black polyethylene mulch. Plots were side- crops, vines must be protected from several less powdery mildew than nine other cultivars dressed in the alleys on 25 July in both years foliar pathogens. In the southeastern United (Precheur et al., 1994). However, both of these with 220 kg·ha–1 10N–4.4P–8.3K. For weed States, both downy mildew and powdery mil- cultivars are C. maxima, and do not produce control, bensulide (S-2-benzenesulfonamidoethyl dew reduce yields (Bost et al., 1991; Shoe- typical jack-o-lantern–type fruit. Conse- O,O-di-isopropyl phosphorodithioate ) (3.4 maker, 1994). In addition, viruses such as quently, this resistance is not as useful for kg·ha–1 a.i.) was applied preplant to alleys in papaya ringspot virus (PRSV), watermelon commercial producers as resistance or toler- 1996 and clomazone {2- [(2-chlorophenyl) mosaic virus (WMV), and zucchini yellow ance would be in C. pepo cultivars. Recently, methyl]-4,4 dimethyl-3-isoxazolidinone} (1.1 mosaic virus (ZYMV) infect C. pepo and C. pepo lines with resistance to powdery mil- kg·ha–1 a.i.) was broadcast preplant in 1997. reduce marketable yields in this region dew have been evaluated in the northeastern Sethoxydim {2-[1-(ethoxyimino)butyl]-5-[2- (Schultheis and Walters, 1998). Little infor- United States (McGrath and Sieczka, 1997), (ethylthio) propyl]-3-hydroxy-2-cyclohexene- but their yield, fruit quality, and resistance to 1-one} (0.31 kg·ha–1 a.i.) also was applied to other diseases under southeastern conditions control grasses in 1997. To manage insects, are not known. No commercially available maximum labeled rates of esfenvalerate [(S)- Received for publication 26 Feb. 1999. Accepted for α publication 25 Aug. 1999. Technical contribution cultivars have resistance to viral diseases, al- -cyano-3-phenoxybenzyl (S)-2-(4-chlorophenyl)- no. 4472 of the South Carolina Agriculture & For- though the cultivars Autumn Gold and Big 3-methylbutyrate] or endosulfan (6,7,8,9,10,10- estry Research System, Clemson. We gratefully Autumn have the precocious yellow gene (Py), hexachloro-1,5,5a,6,9,9a-hexahydro-6,9- acknowledge Warren May III for technical assis- which masks color-breaking caused by virus methano-2,4,3-benzodioxathiepin 3-oxide) tance and Ted Superak, Harris-Moran Seed Co., for infection (Snyder et al., 1993). were applied in alternate weeks from planting providing numbered, powdery mildew-resistant se- The objective of this study was to evaluate until harvest both years; in 1997, Bacillus lections. Salaries were supported in part by Hatch commercially available pumpkin cultivars and thuringiensis and permethrin [3-phenoxybenzyl Project SC01628. The cost of publishing this paper advanced numbered selections for resistance (1RS)-cis,trans-3-(2,2-dichlorovinyl)-2,2- was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must to powdery mildew and potential for yield dimethylcyclopropanecarboxylate] also were be hereby marked advertisement solely to indicate under the humid growing conditions of the used. In 1996, the fungicides chlorothalonil this fact. coastal plain of the southeastern United States. (tetrachloroisophthalonitrile) - triadimefon [1- 1Associate Professor. e-mail: [email protected] Tolerance to virus infection and downy mil- (4-chlorophenoxy)-3,3-dimethyl-1-(1H- 2Agriculture/Animal Associate II. dew also was assessed. 1,2,4,-triazol-1-yl)-2-butanone] (1.7 or 2.5 HORTSCIENCE, VOL. 35(2), APRIL 2000 281 BREEDING, CULTIVARS, ROOTSTOCKS, & GERMPLASM RESOURCES kg·ha–1 a.i. chlorothalonil plus 0.09 or 0.13 on species, days to maturity, fruit size, growth with the lowest ratings (most resistant) were kg·ha–1 a.i. triadimefon) or maneb (manganese habit, and commercial type. HMX 6688, Magic Lantern, and HMX 6686, ethylenebisdithiocarbamate) (1.3 or 1.8 kg·ha– and the C. maxima cultivars Rouge Vif 1 a.i.) plus benomyl [methyl 1-(butylcarbamoyl) Results d’Etamps and Lumina. benzimidazol-2-ylcarbamate] (0.14 or 0.28 Downy mildew. Downy mildew was present kg·ha–1 a.i.) were applied in alternate weeks to Powdery mildew. Powdery mildew was both years and, similar to powdery mildew, manage powdery mildew, and metalaxyl [N- the most prevalent foliar disease in both years, progressed faster in 1996 than in 1997. How- (2,6-dimethylphenyl)-N-(methoxyacetyl)-DL- was more severe in 1996 than in 1997, and, on ever, downy mildew increased late in the sea- alanine methyl ester] - chlorothalonil (0.20 or susceptible cultivars, was not completely con- son in 1997 and contributed to foliage senes- 0.30 kg·ha–1 a.i. metalaxyl plus 1.6 or 2.4 trolled by alternate-week fungicide applica- cence. The highest mean mildew rating on 19 kg·ha–1 a.i. chlorothalonil) or fosetyl-alumi- tions (Table 1). In both years, C. maxima Aug. 1996 was 54% for ‘Rocket,’ but on 5 num [aluminum tris(O-ethyl phosphonate)] cultivars had less powdery mildew overall Sept. 1997, the highest rating was only 3.6% (1.8 or 4.5 kg·ha–1 a.i.) were applied in alter- than did C. pepo cultigens (P = 0.0001). for both ‘Connecticut Field’ and ‘Howden’ nate weeks to manage downy mildew.
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